Low Power Communication Device for Scheduling Data Segments Using Hold Time or Lock Time of Phase Locked Loop

1. A device communicating with a node, the device comprising: a communication unit configured to transmit a transmitting data segment to the node, and receive a receiving data segment from the node; a phase locked loop (PLL) configured to generate an operating frequency for the communication unit; a PLL controller configured to control a hold time and a lock time, of the PLL, that are shared between the node and the device; and a scheduler configured to schedule the transmitting data segment and the receiving data segment based on the controlled hold time and lock time.

2. The device of claim 1 , wherein the hold time and the lock time are determined based on an operating characteristic of the PLL and/or an operating characteristic of a PLL of another device.

3. The device of claim 1 , wherein the scheduler is further configured to: schedule the transmitting data segment and the receiving data segment further based on information on a data communication protocol that is shared between the node and the device.

4. The device of claim 3 , wherein the information on the data communication protocol comprises a number of transmitting data segments to be transmitted continuously before receiving an acknowledgement message.

5. The device of claim 3 , wherein the data communication protocol comprises an automatic repeat request (ARQ) protocol.

6. The device of claim 1 , wherein the PLL comprises: a first PLL configured to generate an operating frequency for the communication unit to receive the receiving data segment, and/or a second PLL configured to generate an operating frequency for the communication unit to transmit the transmitting data segment.

7. The device of claim 1 , wherein the scheduler is further configured to: adjust a number of transmitting data segments and receiving data segments to be scheduled within the controlled hold time.

8. The device of claim 7 , wherein the scheduler is further configured to: adjust the number of transmitting data segments and receiving data segments to be scheduled within the controlled hold time based on a channel state, or an amount of interference, or an amount of traffic, or any combination thereof, between the device and the node.

9. The device of claim 1 , wherein the communication unit is further configured to: transmit, to the node, a PLL lock indicator indicating whether a PLL of the node is to be locked in response the node processing a corresponding data segment, or in response to a predetermined period of time elapsing from a time that the node processes the corresponding data segment.

10. The device of claim 1 , wherein the communication unit is further configured to: transmit, to the node, a PLL count indicator indicating a number of data segments to be processed by the node, subsequent to the node processing a corresponding data segment, before a PLL of the node is to be locked.

11. The device of claim 1 , wherein the communication unit is further configured to: receive, from the node, a PLL lock indicator indicating whether the PLL is to be locked in response to the device processing a corresponding data segment, or in response to a predetermined period of time elapsing from a time that the device processes the corresponding data segment.

12. The device of claim 1 , wherein the communication unit is further configured to: receive, from the node, a PLL count indicator indicating a number of data segments to be processed by the device, subsequent to the device processing a corresponding data segment, before the PLL is to be locked.

13. The device of claim 1 , wherein the hold time comprises a predetermined period of time during which the operating frequency is maintained in response to operation of the PLL being stopped.

14. The device of claim 1 , wherein the lock time comprises a predetermined period of time for the PLL to generate and maintain the operating frequency in response to operation of the PLL being initiated.

15. The device of claim 1 , wherein the scheduler is further configured to: schedule the transmitting data segment to be transmitted during the controlled hold time.

16. The device of claim 1 , wherein the scheduler is further configured to: schedule the receiving data segment to be received during the controlled hold time and/or in response to the controlled lock time elapsing and the PLL being on.

17. A device communicating with a node, the device comprising: a sensor unit configured to sense a biometric signal; a communication unit configured to transmit, to the node, a transmitting data segment of the biometric signal, and receive, from the node, a receiving data segment; a phase locked loop (PLL) configured to generate an operating frequency for the communication unit; a PLL controller configured to control a hold time and a lock time, of the PLL, that are shared between the node and the device; and a scheduler configured to schedule the transmitting data segment and the receiving data segment based on the controlled hold time and lock time.

18. A device communicating with a node, the device comprising: a communication unit configured to transmit a transmitting data segment to the node; a phase locked loop (PLL) configured to generate an operating frequency for the communication unit; a PLL controller configured to control a hold time and a lock time, of the PLL, that are shared between the node and the device; and a scheduler configured to schedule the transmitting data segment based on the controlled hold time and lock time.

19. The device of claim 18 , wherein the scheduler is further configured to: schedule the transmitting data segment further based on information on an automatic repeat request (ARQ) protocol that is shared between the node and the device.

20. The device of claim 18 , wherein the scheduler is further configured to: adjust a number of transmitting data segments to be scheduled within the controlled hold time based on a channel state, or an amount of interference, or an amount of traffic, or any combination thereof, between the device and the node.